SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2022, Vol. 42 ›› Issue (2): 35-41.DOI: 10.1016/j.cjche.2021.07.027

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Stable titanium metal-organic framework with strong binding affinity for ethane removal

Puxu Liu1, Yong Wang1, Yang Chen1, Xiaoqing Wang1, Jiangfeng Yang1, Libo Li1,2, Jinping Li1   

  1. 1. College of Chemistry and Chemical Engineering, Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization, Taiyuan University of Technology, Taiyuan 030024, China;
    2. Key Laboratory of Coal Science and Technology, Taiyuan University of Technology, Taiyuan 030024, China
  • Received:2021-04-01 Revised:2021-07-19 Online:2022-03-30 Published:2022-02-28
  • Contact: Libo Li,E-mail:lilibo908@hotmail.com
  • Supported by:
    We gratefully acknowledge the financial support from the National Natural Science Foundation of China (21922810, 21908153, 21908155) and program of Innovative Talents of Higher Education Institutions of Shanxi. We are grateful for the supported by Cultivate Scientific Research Excellence Programs of Higher Education Institutions in Shanxi (CSREP).

Stable titanium metal-organic framework with strong binding affinity for ethane removal

Puxu Liu1, Yong Wang1, Yang Chen1, Xiaoqing Wang1, Jiangfeng Yang1, Libo Li1,2, Jinping Li1   

  1. 1. College of Chemistry and Chemical Engineering, Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization, Taiyuan University of Technology, Taiyuan 030024, China;
    2. Key Laboratory of Coal Science and Technology, Taiyuan University of Technology, Taiyuan 030024, China
  • 通讯作者: Libo Li,E-mail:lilibo908@hotmail.com
  • 基金资助:
    We gratefully acknowledge the financial support from the National Natural Science Foundation of China (21922810, 21908153, 21908155) and program of Innovative Talents of Higher Education Institutions of Shanxi. We are grateful for the supported by Cultivate Scientific Research Excellence Programs of Higher Education Institutions in Shanxi (CSREP).

Abstract: Direct separation of high purity ethylene (C2H4) from an ethane (C2H6)/ethylene mixture is a critical and challenging task owing to the very similar molecular size and physical properties of the two components. While some studies have attempted this separation, there is a lack of excellent porous materials with strong binding affinity for C2H6-selective adsorption via an energy-efficient adsorptive separation process. Herein, we report a titanium metal-organic framework with strong binding affinity and excellent stability for the highly efficient removal of C2H6 from C2H6/C2H4 mixtures. Single component adsorption isotherms demonstrated a larger amount of adsorbed ethane (1.16 mmol·g-1 under 1 kPa) and high C2H6/C2H4 selectivity (2.7) for equimolar C2H6/C2H4 mixtures, especially in the low-pressure range, which is further confirmed by the results of grand canonical Monte Carlo simulations for C2H6 adsorption in this framework. The experimental breakthrough curves showed that C2H4 with a high purity was collected directly from both 1:9 and 1:15 C2H6/C2H4 (volume ratio) mixtures at 298 K and 100 kPa. Moreover, the unchanged adsorption and separation performance after cycling experiments confirmed the promising applicability of this material in future.

Key words: Titanium metal-organic framework, Adsorption, Separation, Ethylene purification, Strong binding affinity, Molecular simulation

摘要: Direct separation of high purity ethylene (C2H4) from an ethane (C2H6)/ethylene mixture is a critical and challenging task owing to the very similar molecular size and physical properties of the two components. While some studies have attempted this separation, there is a lack of excellent porous materials with strong binding affinity for C2H6-selective adsorption via an energy-efficient adsorptive separation process. Herein, we report a titanium metal-organic framework with strong binding affinity and excellent stability for the highly efficient removal of C2H6 from C2H6/C2H4 mixtures. Single component adsorption isotherms demonstrated a larger amount of adsorbed ethane (1.16 mmol·g-1 under 1 kPa) and high C2H6/C2H4 selectivity (2.7) for equimolar C2H6/C2H4 mixtures, especially in the low-pressure range, which is further confirmed by the results of grand canonical Monte Carlo simulations for C2H6 adsorption in this framework. The experimental breakthrough curves showed that C2H4 with a high purity was collected directly from both 1:9 and 1:15 C2H6/C2H4 (volume ratio) mixtures at 298 K and 100 kPa. Moreover, the unchanged adsorption and separation performance after cycling experiments confirmed the promising applicability of this material in future.

关键词: Titanium metal-organic framework, Adsorption, Separation, Ethylene purification, Strong binding affinity, Molecular simulation